This is a really difficult question to answer.  The first thing that comes to my mind is the Mark Twain quote:  "Find a job you enjoy doing, and you will never have to work a day in your life."  So if you are married to the person you love and you are employed doing what you both love then the need to impose boundaries is not only not easy but is probably not needed--at least as concerns your marriage.  The problem comes in an office environment when there are other people involved who might be tempted for their own purposes to drive a wedge in between you.  That is why certain businesses prohibit spouses from working together to the point where one of any two employees who decide to marry is forced to leave the company.  But I have also witnessed marriages where non-personal professional confidences made to one spouse are respected and not shared with the other spouse without having any harmful impact on their marriage.  Transparency, professionalism, a sense of humor, and lots of love will get couples through anything.